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논문 기본 정보
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- 2017
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초록· 키워드
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Zinc oxide one of the metal oxide semiconductor, and it is harmless to human and environmental friendly. It has excellent chemical and thermal stability properties. Wurtzite-zinc oxide has a large band gap energy of 3.37 eV and high exciton binding energy of 60 meV. It can be applied to various fields including solar cells, degradation of the dye waste, and the gas sensor.
The photocatalytic activity of zinc oxide is varied based on the particle shape and change of crystallinity. Therefore, It is very important to specify the additives and the experimental variables.
Microwave hydrothermal synthesis has advantages such as short reaction time, high yield and energy efficiency, and high speed crystallization. In addition, comparing to conventional experimental methods, it is very effective for synthesis of products.
In this study, the zinc oxide was synthesized by using a microwave assisted hydrothermal synthesis. The precursor was used as the zinc nitrate, and pH adjustment agents was used as NaOH, NH4OH and KOH. Surfactants are the ethanolamine, cetyltrimethylammonium bromide, sodium dodecyl sulfate, sorbitan monooleate was added by changing the concentration. The composite particles had the shape of a star-like, circular cone, seed shape, flake-sphere. Photocatalytic activity was confirmed high decolorization efficiencies of up to 94.6% by flake-sphere of zinc oxide.
Physical and chemical properties of the obtained zinc oxide was characterized by using x-ray diffractometer, field emission scanning electron microscopy, and thermogravimetric analysis. Optical properties was characterized by using UV-visible spectroscopy, photoluminescence spectroscopy and raman spectroscopy.
The photocatalytic activity of zinc oxide is varied based on the particle shape and change of crystallinity. Therefore, It is very important to specify the additives and the experimental variables.
Microwave hydrothermal synthesis has advantages such as short reaction time, high yield and energy efficiency, and high speed crystallization. In addition, comparing to conventional experimental methods, it is very effective for synthesis of products.
In this study, the zinc oxide was synthesized by using a microwave assisted hydrothermal synthesis. The precursor was used as the zinc nitrate, and pH adjustment agents was used as NaOH, NH4OH and KOH. Surfactants are the ethanolamine, cetyltrimethylammonium bromide, sodium dodecyl sulfate, sorbitan monooleate was added by changing the concentration. The composite particles had the shape of a star-like, circular cone, seed shape, flake-sphere. Photocatalytic activity was confirmed high decolorization efficiencies of up to 94.6% by flake-sphere of zinc oxide.
Physical and chemical properties of the obtained zinc oxide was characterized by using x-ray diffractometer, field emission scanning electron microscopy, and thermogravimetric analysis. Optical properties was characterized by using UV-visible spectroscopy, photoluminescence spectroscopy and raman spectroscopy.
목차
I. 서 론 1Ⅱ. 실 험 7Ⅱ-1. 실험 재료 7Ⅱ-2. 실험 방법 8Ⅱ-3. 분석 방법 13Ⅲ. 결과 및 고찰 15Ⅲ-1. 알칼리원에 따른 산화아연의 합성 15Ⅲ-1-1. 알칼리원의 종류에 따른 영향 15Ⅲ-1-2. pH 조절에 따른 영향 18Ⅲ-2. 계면활성제 종류에 따른 산화아연의 합성 20Ⅲ-2-1. 계면활성제 종류에 따른 영향 20Ⅲ-2-2. XRD 분석 28Ⅲ-2-3. TGA 분석 28Ⅲ-2-4. Raman 분석 30Ⅲ-2-5. 광 발광 분석 33Ⅲ-3. 합성된 산화아연의 광촉매 특성 35Ⅲ-3-1. 광촉매 활성 분석 35Ⅲ-3-2. 산화아연 필름의 투명도 평가 37Ⅲ-3-3. 산화아연 필름의 열 효능 평가 39Ⅳ. 결 론 43참고 문헌 45감사의 글 52
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